What is a rule for the series below?

1/5 + 1/10 + 1/15 + 1/20 + 1/25

I think it is 1/5k, but the answer key says 1/5^k?

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  1. As long as you mean
    Tk=1/(5k) is the rule for term k of the given sequence Tk, you're correct.

    Perhaps 1/(5^k) refers to a different series.

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